/*!
    \file  main.c
    \brief running led
    
    \version 2019-6-5, V1.0.0, firmware for GD32VF103
*/

/*
    Copyright (c) 2019, GigaDevice Semiconductor Inc.

    Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice, this 
       list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright notice, 
       this list of conditions and the following disclaimer in the documentation 
       and/or other materials provided with the distribution.
    3. Neither the name of the copyright holder nor the names of its contributors 
       may be used to endorse or promote products derived from this software without 
       specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
OF SUCH DAMAGE.
*/

#include "gd32vf103.h"
#include "systick.h"
#include <stdio.h>

/* BUILTIN LED OF LONGAN BOARDS IS PIN PC13 */
#define LED_PIN1  GPIO_PIN_2
//#define LED_PIN2  GPIO_PIN_13
#define LED_GPIO_PORT1  GPIOA
//#define LED_GPIO_PORT2  GPIOC
#define LED_GPIO_CLK1  RCU_GPIOA
//#define LED_GPIO_CLK2  RCU_GPIOC
void longan_led_init()
{
    /* enable the led clock */
    rcu_periph_clock_enable(LED_GPIO_CLK1);
    /* configure led GPIO port */ 
    gpio_init(LED_GPIO_PORT1, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, LED_PIN1);

    GPIO_BC(LED_GPIO_PORT1) = (LED_PIN1);
}

void longan_led_on()
{
    GPIO_BOP(LED_GPIO_PORT1) = (LED_PIN1);
}

void longan_led_off()
{
    GPIO_BC(LED_GPIO_PORT1) = (LED_PIN1);
}
void init_uart0(void)
{    
    /* enable GPIO clock */
    rcu_periph_clock_enable(RCU_GPIOA);
    /* enable USART clock */
    rcu_periph_clock_enable(RCU_USART0);

    /* connect port to USARTx_Tx */
    gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_9);
    /* connect port to USARTx_Rx */
    gpio_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_10);

    /* USART configure */
    usart_deinit(USART0);
    usart_baudrate_set(USART0, 115200U);
    usart_word_length_set(USART0, USART_WL_8BIT);
    usart_stop_bit_set(USART0, USART_STB_1BIT);
    usart_parity_config(USART0, USART_PM_NONE);
    usart_hardware_flow_rts_config(USART0, USART_RTS_DISABLE);
    usart_hardware_flow_cts_config(USART0, USART_CTS_DISABLE);
    usart_receive_config(USART0, USART_RECEIVE_ENABLE);
    usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);
    usart_enable(USART0);

    usart_interrupt_enable(USART0, USART_INT_RBNE);
}

int _put_char(int ch)
{
    usart_data_transmit(USART0, (uint8_t) ch );
    while ( usart_flag_get(USART0, USART_FLAG_TBE)== RESET){
    }

    return ch;
}
/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/
int main(void)
{
    longan_led_init();
    uint8_t  MENU;
	uint16_t  t,i;
	//设置变量的初始值
	MENU = 0;
	t = 1;
   
    while(1){
         printf("程序开始了");
      if(MENU == 0){ //变亮循环
			for(i = 0; i < 5; i++){
				longan_led_on(); //LED1接口输出高电平1
				delay_1us(t); //延时
				longan_led_off(); //LED1接口输出低电平0
				delay_1us(501-t); //延时
			}
			t++;
			if(t==500){
				MENU = 1;
			}
		}
		//菜单1
		if(MENU == 1){ //变暗循环
			for(i = 0; i < 5; i++){
				longan_led_on(); //LED1接口输出高电平1
				delay_1us(t); //延时
				longan_led_off();//LED1接口输出低电平0
				delay_1us(501-t); //延时
			}
			t--;
			if(t==1){
				MENU = 0;
			}
		}	
    }
}
